May is Skin Cancer Awareness Month, a time when dermatologists, oncologists, and patient advocates work to educate the public about prevention, early detection, and treatment. While most skin cancers are effectively treated with surgery or standard radiation, a small but important subset of patients face diagnoses that require something more precise.
For patients with rare or advanced skin cancers located near critical structures, proton therapy has emerged as a valuable treatment option that can deliver high doses of radiation to the tumor while protecting the delicate tissue surrounding it.
Which Skin Cancers Might Benefit from Proton Therapy?
Not every skin cancer requires proton therapy — but certain rare and aggressive types often do.
Merkel Cell Carcinoma
Merkel cell carcinoma is a rare but aggressive neuroendocrine skin cancer that tends to arise on sun-exposed areas of the face, neck, and scalp. Because these tumors often develop in locations adjacent to the brain, eyes, or salivary glands, conventional radiation carries a meaningful risk of collateral damage. Proton therapy’s ability to stop radiation dose at a precise depth makes it particularly attractive when treating lesions on the head and neck region.
Cutaneous Angiosarcoma
Angiosarcoma of the scalp is known for its tendency to spread beyond visible margins. Radiation therapy plays a major role in both definitive and post-surgical management. When the treatment field overlaps with the brain, orbit, or major blood vessels, proton therapy may be recommended to reduce integral dose to these structures.
Advanced Basal or Squamous Cell Carcinoma Near Critical Structures
Locally advanced or recurrent basal and squamous cell carcinomas — particularly those invading the orbit, nasal cavity, or auditory canal — can present complex dosimetric challenges. The ability to conform radiation tightly around the tumor with minimal exit dose is clinically meaningful in these cases.
The Proton Advantage: Precision at the Cellular Level
What makes proton therapy different from conventional X-ray radiation is the physics of how protons interact with tissue. Protons travel into the body and release the majority of their energy at a precise depth — what physicists call the Bragg Peak. Unlike X-rays, which continue to deposit energy as they exit the body, protons stop. This means less radiation reaches healthy structures beyond the tumor.
At Tennessee Oncology Proton Center, we use Pencil Beam Scanning (PBS) technology, which allows our team to paint the proton beam across the target volume with millimeter-level accuracy. For skin cancers of the face and scalp — where the eyes, brain, and parotid glands may be just millimeters away — this level of precision can be the difference between preserving function and losing it.
What the Research Shows
Published series support the use of proton therapy for head and neck skin cancers. Studies have demonstrated that proton therapy achieves excellent local control rates for Merkel cell carcinoma while significantly reducing dose to the brainstem and cochlea compared to photon plans. The National Cancer Institute recognizes proton therapy as a viable treatment modality for select malignancies where dose reduction to surrounding tissue is a clinical priority.
Talking to Your Oncologist This May
If you or a loved one has been diagnosed with a rare or advanced skin cancer, particularly one near the face, scalp, or neck, it is worth asking whether proton therapy should be part of the treatment discussion. A consultation does not obligate you to any particular treatment — it simply ensures you have a complete picture of your options.
The team at Tennessee Oncology Proton Center includes board-certified radiation oncologists with experience treating complex head and neck cases. We work in close collaboration with your dermatologic surgeon and medical oncologist to develop a plan that puts your quality of life at the center of every decision.
This Skin Cancer Awareness Month, we encourage you to look beyond the standard conversation. For those facing rare and difficult diagnoses, proton therapy may offer a path to treatment that protects what matters most. Contact us to schedule a consultation.
